High Ground

High ground adds a unique layer of strategy to StarCraft II. Experiment with different units at various terrain elevations, and you'll find that proper use of this terrain feature can yield great results.

Your enemies cannot see or attack troops on higher ground unless they have a spotter to provide them vision of the elevated terrain. The only exceptions to this rule are air units or tall units like the colossus.

Terran vikings land and shoot from high ground at a Zerg expansion. With the vikings as backup, other terran units can push their way into the expansion.[1]